Heavy Metal Adsorption onto Kappaphycus sp. from Aqueous Solutions: The Use of Error Functions for Validation of Isotherm and Kinetics Models

Table 4

Maximum adsorption capacity of heavy metals by some low-cost sorbents.

Low-cost sorbent	Adsorption capacity (mg g^−1)				Reference
	Pb^2+	Cu^2+	Fe^2+	Zn^2+
Activated carbon from coconut	4.56	—	—	—	[41]
Activated carbon from seed hull of the palm tree	3.58	—	—	—	[41]
Epichlorohydrin-crosslinked chitosan	34.13	35.46	—	10.21	[42]
Hazelnut husk	13.05	6.645	—	—	[43]
Natural muscovite	0.63	0.618	—	—	[44]
Kaolinite	7.75	4.42	—	4.95	[45]
Modified orange peel	73.53	15.27	—	—	[46]
Coconut tree sawdust	25.00	3.89	—	23.81	[47]
Sugarcane bagasse	21.28	3.65	—	40.00	[47]
Kappaphycus sp.	22.27	19.46	17.09	16.78	Present study